<!-- 关键点在于使用 border-radiuss 生成一个不太圆的圆，然后对纯色块进行切割-->
<!-- 详情参见：https://github.com/chokcoco/iCSS/issues/22-->


<h2>Pure Css Wave</h2>

<style>
  body {
    position: relative;
    align-items: center;
    min-height: 100vh;
    background-color: rgb(118, 218, 255);
    overflow: hidden;


  }

  body:before,
  body:after {
    content: "";
    position: absolute;
    left: 50%;
    min-width: 300vw;
    min-height: 300vw;
    background-color: #fff;
    animation-name: rotate;
    animation-iteration-count: infinite;
    animation-timing-function: linear;
  }

  /* 使用bottom来控制波浪的具体位置 */
  body:before {
    bottom: 15vh;
    border-radius: 45%;
    animation-duration: 10s;
  }

  body:after {
    bottom: 12vh;
    opacity: .5;
    border-radius: 47%;
    animation-duration: 10s;
  }

  @keyframes rotate {
    0% {
      transform: translate(-50%, 0) rotateZ(0deg);
    }

    50% {
      transform: translate(-50%, -2%) rotateZ(180deg);
    }

    100% {
      transform: translate(-50%, 0%) rotateZ(360deg);
    }
  }

  h2 {
    position: relative;
    color: #333;
    z-index: 10;
    text-align: center;
    height: 100vh;
    line-height: 140vh;
    font-size: 8vw;
    text-shadow: 3px 3px 2px #999;
  }
</style>